JP2013092181A - Gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gasket configured to improve cooling efficiency of a heat exchanger arranged in an intake air passage of an engine.SOLUTION: An outer seal 95 of the gasket 85 comes into contact with an inner wall 62, and controls movement of a base 86 and an inner seal 98 toward an inner wall 62. The inner seal 98 comes into contact with an outer wall 82, and controls movement of the base 86 and the outer seal 95 toward an outer wall 82. The cooling efficiency of the intercooler 65 can be improved since a gap between the inner wall 62 and the outer wall 82 is covered with the gasket 85, and the air in the housing 42 can pass through an air cooling passage 80 without passing through the gap. The movement of the gasket 85 applied with the air in the housing 42 is regulated through the use of the outer seal 95 and inner seal 98, thereby preventing the gasket 85 from being lifted from the inner wall 62 and outer wall 82, while improving cooling efficiency of the intercooler 65.

Description

  The present invention relates to a gasket provided between an inner wall of an intake air passage of an engine and an outer wall of a heat exchanger installed in the intake air passage.

  The intake charge rate of the engine increases as the temperature of the air supplied to the engine decreases. As the intake charge rate increases, more fuel can be burned and the engine output increases. For this reason, conventionally, for the purpose of increasing the output of the engine, the air taken in by the intake device is cooled and then supplied into the cylinder of the engine. The water-cooled heat exchanger disclosed in Patent Document 1 cools the air flowing in the intake manifold. There is a gap between the outer wall of the heat exchanger and the inner wall of the intake manifold.

Japanese Patent Laid-Open No. 11-324686

  According to the heat exchanger disclosed in Patent Document 1, a part of the air flowing in the intake manifold is supplied to the engine cylinder through the gap without passing through the air cooling passage of the heat exchanger. Therefore, a part of the air flowing through the intake manifold is supplied to the engine cylinder without being cooled. Therefore, the intake air of the engine is not sufficiently cooled, and there is a concern that knocking may occur.

On the other hand, it is conceivable to close the gap with a gasket. This gasket is, for example, a rubber made of a band part extending in the circumferential direction along the outer wall of the heat exchanger and a seal part protruding from the band part toward the inner wall side of the intake manifold and coming into contact with the inner wall. It is done.
However, this gasket may be separated from the outer wall of the heat exchanger when subjected to the action of air flowing in the intake manifold. When the gasket is thus separated from the outer wall of the heat exchanger, there is a problem that a gap is left between the heat exchanger and the gasket, and the cooling efficiency of the heat exchanger is reduced.

  This invention is made | formed in view of such a point, The objective is to provide the gasket which can improve the cooling efficiency of the heat exchanger installed in the intake air passage of an engine.

The invention according to claim 1 is a gasket provided between an inner wall of an intake air passage of an engine and an outer wall of a heat exchanger installed in the intake air passage, wherein the base, the outer seal portion, and the inner seal portion are provided. Prepare. The base portion is formed between the inner wall and the outer wall so as to extend in a circumferential direction perpendicular to the flow direction of the intake air passage.
The outer seal portion is formed integrally with the base portion, protrudes outward from the base portion, and comes into contact with the inner wall. The outer seal portion hermetically seals the gap between the base portion and the inner wall and restricts the movement of the base portion toward the inner wall.

The inner seal portion is formed integrally with the base portion, protrudes inward from the base portion, and comes into contact with the outer wall. The inner seal portion hermetically seals the gap between the base portion and the outer wall and restricts the movement of the base portion toward the outer wall.
According to this, since the gap between the inner wall and the outer wall is blocked by the gasket, the air flowing through the intake air passage passes through the air cooling passage of the heat exchanger without passing through the gap. The air passing through the air cooling passage is cooled by taking heat from the cooling water of the heat exchanger. Therefore, the cooling efficiency of the heat exchanger can be increased.

  In addition, the outer seal portion interposed between the base portion and the inner wall suppresses the inner seal portion of the gasket that has been affected by the air flowing through the intake air passage from being separated from the outer wall. In addition, the inner seal portion interposed between the base portion and the outer wall suppresses the outer seal portion of the gasket subjected to the action of the air from being separated from the inner wall. Therefore, it is possible to suppress a gap from being formed between the gasket and the inner wall and the outer wall due to the gasket floating from the inner wall and the outer wall, thereby further improving the cooling efficiency of the heat exchanger.

Here, in the case of the rubber gasket integrally formed from the above-described band portion and the seal portion, in order to eliminate the floating of the gasket, a key shape that forms a hole in the band portion of the gasket and engages with the hole is formed. It is conceivable to form protrusions on the heat exchanger and restrict the movement of the gasket with the key-like protrusions. However, according to this, there is a problem that cracks are easily generated from the hole of the gasket that engages with the key-like protrusion, and the durability of the gasket is lowered.
On the other hand, according to the first aspect of the present invention, it is possible to suppress the gasket from being separated from the inner wall and the outer wall without forming a hole engaging with the key-like protrusion in the rubber portion of the gasket. The above problem does not occur.

In addition, in the case of a rubber gasket that is attached to the flange protruding outward from the outer wall of the heat exchanger and fits into the groove on the inner wall of the intake air passage, the gasket adheres closely to the inner wall of the intake air passage and the outer wall of the heat exchanger For this reason, the floating of the gasket is eliminated. However, when the heat exchanger and the gasket are installed in the intake air passage, it is necessary to fit the groove in the inner wall of the intake air passage while collapsing the gasket in the thickness direction. Therefore, there exists a problem that a heat exchanger deform | transforms with the reaction force which acts on a heat exchanger from a gasket.
On the other hand, according to the first aspect of the present invention, the gasket can be attached without being attached to the flange portion of the heat exchanger and without being fitted into the groove of the inner wall of the intake air passage. The above problem does not occur.

In the invention according to claim 2, the outer seal portion includes a first outer lip protruding from the upstream side in the flow direction to the inner wall side in the base portion, and a downstream portion in the flow direction in the base portion from the downstream side in the flow direction. Consists of a protruding second outer lip. The inner seal portion includes a first inner lip projecting from the upstream side in the flow direction to the outer wall side in the base portion, and a second inner lip projecting from the downstream side in the flow direction to the outer wall side in the base portion. .
Thus, according to the gasket whose cross section orthogonal to the circumferential direction is X-shaped, the gasket contacts the inner wall and the outer wall at two locations on the upstream side and the downstream side in the flow direction. It is possible to further suppress the gap between the outer wall and the outer wall. Moreover, since the posture of the gasket is stabilized, the vibration of the gasket can be suppressed. Therefore, the sealed state of the gap between the inner wall and the outer wall can be maintained.

In the invention according to claim 3, the first outer lip protrudes from the base portion to the opposite side of the second outer lip in a state where the gasket is provided between the inner wall and the outer wall, and the protruding tip The part is formed to extend upstream in the flow direction along the inner wall.
According to this, since the 1st outer side lip which received the effect | action of the upstream air with respect to a gasket is pressed on the said inner wall, it can suppress further that a clearance gap opens between a gasket and the said inner wall.

In the invention according to claim 4, the first inner lip protrudes from the base to the side opposite to the second inner lip in a state where the gasket is provided between the inner wall and the outer wall, and the protruding tip The part is formed to extend upstream in the flow direction along the outer wall.
According to this, since the first inner lip that has been subjected to the upstream air action on the gasket is pressed against the outer wall, it is possible to further suppress a gap from being formed between the gasket and the outer wall.

In the invention according to claim 5, the base portion has an engaged portion that can be engaged with an engaging portion formed by the inner wall or the outer wall. In the invention according to claim 6, the engaged portion of the base is a hole into which the engaging portion constituted by a protrusion can be inserted.
According to this, the gasket can be fixed to the inner wall or the outer wall with a simple configuration, and the assembling property of the gasket is improved.

In the invention according to claim 7, the engaged portion of the base portion engages with the engaging portion formed by the inner wall. Further, the pressure receiving area of the outer seal portion that receives the action of air upstream from the gasket is larger than the pressure receiving area of the inner seal portion that receives the action of air.
According to this, the gasket which receives the action of the air is further pressed against the inner wall side to which the gasket is fixed, and the holding force is increased.

In the invention according to claim 8, the engaged portion of the base portion is engaged with the engaging portion formed by the outer wall. In addition, the pressure receiving area of the inner seal portion that receives the action of air on the upstream side of the gasket is larger than the pressure receiving area of the outer seal portion that receives the action of air.
According to this, the gasket which receives the action of the air is further pressed against the outer wall side to which the gasket is fixed, and the holding force is increased.

In the invention according to claim 9, the base portion has a protruding portion protruding in the flow direction. In addition, the gasket includes a vibration isolating portion that is formed integrally with the protruding portion of the base portion and is made of an elastic body that is sandwiched between the inner wall and the outer wall.
According to this, the vibration of the gasket can be suppressed, and it is possible to further suppress the gap between the gasket and the inner wall and the outer wall. Further, since the vibration isolating portion also serves as a gasket fixing means, the number of parts can be reduced and the number of assembling steps can be reduced.

It is a conceptual diagram of an engine system provided with the air cooler using the gasket by 1st Embodiment of this invention. It is a top view of the housing of the air cooler of FIG. It is the figure which looked at the housing of FIG. 2 from the arrow III direction. (A) IV-IV sectional view of the housing of FIG. 2, (b) It is an enlarged view of the arrow b part of (a). It is the VV sectional view taken on the line of the housing of FIG. It is a top view of the intercooler of the air cooler of FIG. It is the figure which looked at the intercooler of FIG. 6 from the arrow VII direction. FIG. 5 is an enlarged view of the arrow VIII in FIG. It is a perspective view of the gasket of the air cooler of FIG. It is sectional drawing which shows the gasket by 2nd Embodiment of this invention, Comprising: It is a figure corresponding to FIG. 4 in 1st Embodiment. It is the XI-XI sectional view taken on the line of the housing of FIG.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
The gasket by 1st Embodiment of this invention is used for the air cooler with which the engine system shown in FIG. 1 is provided. First, this engine system will be described.

As shown in FIG. 1, the engine system 1 includes an engine 2, an intake device 10, an exhaust device 22, a supercharger 31, and an air cooler 40.
The engine 2 compresses the air-fuel mixture in the cylinder 3 and burns it, and extracts the force acting on the piston (not shown) from the combustion gas expanding in the cylinder 3 as kinetic energy. This kinetic energy is used as the driving force of the vehicle. An intake device 10 and an exhaust device 22 are connected to the engine 2.

  The intake device 10 includes an air cleaner 11, an air cooler 40, a throttle valve device 13, an intake manifold 15, and a plurality of intake pipes 16, 18, 19, 20, and 21 that connect them. The intake pipe 16 has an air intake port 17. The air cleaner 11 removes foreign matter in the air taken in through the air intake port 17. The air cooler 40 cools the air compressed by the supercharger 31. The throttle valve device 13 is provided between the air cooler 40 and the intake manifold 15 and controls the flow rate by changing the cross-sectional area of the passage. The intake manifold 15 is a branch pipe that guides the air supplied from the throttle valve device 13 to each cylinder 3 of the engine 2.

  Intake pipe 16, air cleaner 11, intake pipe 18, housing 34 of supercharger 31, intake pipe 19, housing 42 of air cooler 40, intake pipe 20, valve body 14 of throttle valve device 13, intake pipe 21 and intake manifold Reference numeral 15 denotes an intake air passage forming member that forms an “intake air passage”.

The exhaust device 22 includes an exhaust manifold 23, a catalytic converter 24, a muffler 25, and exhaust pipes 26, 27, 28, and 29 connecting them. The exhaust manifold 23 collects exhaust discharged from each cylinder 3 of the engine 2. The catalytic converter 24 purifies the exhaust. The muffler 25 reduces exhaust noise. The exhaust pipe 29 has an air opening 30.
The exhaust manifold 23, the exhaust pipe 26, the housing 35 of the supercharger 31, the exhaust pipe 27, the catalytic converter 24, the exhaust pipe 28, the muffler 25, and the exhaust pipe 29 are exhaust passage forming members that form an exhaust passage.

  The supercharger 31 is an exhaust drive type, and includes a turbine wheel 32 that is rotationally driven by exhaust of the engine 2, a compressor wheel 33 that rotates together with the turbine wheel 32 and compresses air, and housings 34 and 35. . The supercharger 31 is a device that sends more air into each cylinder 3 of the engine 2 by compressing air, that is, supercharges.

The air cooler 40 includes a cooling water pump 41, a housing 42, an intercooler 65 as a “heat exchanger”, a gasket 85, a sub radiator 105, and cooling water pipes 106, 107, and 108.
The cooling water pump 41 forcibly circulates the cooling water in the air cooler 40. The discharge port of the cooling water pump 41 is connected to the inlet pipe 69 of the intercooler 65 through the cooling water pipe 106. The inlet of the cooling water pump 41 is connected to the sub radiator 105 via the cooling water pipe 108.

The intercooler 65 is provided in a housing 42 that connects the intake pipe 19 and the intake pipe 20 to each other. The intercooler 65 is a water-cooled heat exchanger that cools the air by removing the heat of the air passing through the housing 42. The intercooler 65 functions as a heat absorption part in the air cooler 40. The intercooler 65 is connected to the sub radiator 105 through the cooling water pipe 107.
The gasket 85 is provided between the inner wall of the housing 42 and the outer wall of the intercooler 65.

  The sub-radiator 105 is an air-cooled heat exchanger that releases heat of the cooling water sent from the intercooler 65 via the cooling water pipe 106 and cools the cooling water. The sub radiator 105 is subjected to, for example, vehicle traveling wind or wind from a cooling fan (not shown) to promote heat dissipation. The sub radiator 105 functions as a heat radiating part in the air cooler 40.

Next, the structure of the air cooler 40 is demonstrated in detail based on FIGS.
As shown in FIGS. 2 to 4, the housing 42 includes a housing portion 43 that houses the intercooler 65, an introduction pipe 60 that connects the housing portion 43 and the intake pipe 19, and the housing portion 43 and the intake pipe 20. The lead-out pipe 61 is connected.
As shown in FIGS. 2, 4 and 5, the accommodating portion 43 is formed in a box shape. Specifically, the accommodating portion 43 includes a first plate portion 44 and a second plate portion 45 that face each other in the flow direction indicated by an arrow A in FIG. 4, the flow direction, and an interface indicated by an arrow B in FIG. The third plate portion 46 and the fourth plate portion 47 that face each other in the direction orthogonal to the insertion direction of the cooler 65 and the fifth plate portion 48 that closes one end of the cylinder made of the plate portions 44 to 47 are integrated. Formed.

As shown in FIG. 4, a through hole 49 communicating with the introduction pipe 60 is formed in the first plate portion 44, and a through hole 50 communicating with the outlet tube 61 is formed in the second plate portion 45.
As shown in FIG. 5, the insertion port 51 of the intercooler 65 is formed inside the other end of the cylinder composed of the plate portions 44 to 48, and the flange for fixing the mounting portion 81 of the intercooler 65 is formed outside. A portion 52 is formed. Further, the inner surface of the connection portion between the third plate portion 46 and the fifth plate portion 48 and the inner surface of the connection portion between the fourth plate portion 47 and the fifth plate portion 48 are formed to be curved surfaces. .
Of the housing 42, the third plate portion 46, the fifth plate portion 48, and the fourth plate portion 47 form an inner wall 62 that is continuous without a step in the circumferential direction orthogonal to the flow direction. The inner wall 62 corresponds to an “inner wall” in the claims.

4-7, the intercooler 65 is comprised from the inlet tank 66, the intermediate | middle tank 67, the outlet tank 68, the inlet pipe 69, the outlet pipe 70, the connection members 71 and 72, the cooler core 73, the attaching part 81, etc. Is done.
The inlet tank 66 and the outlet tank 68 are box-shaped tanks arranged on the insertion port 51 side in the housing portion 43 of the housing 42. The tanks 66 and 68 are arranged with a predetermined distance from the third plate portion 46 and the fourth plate portion 47.
The inlet pipe 69 is connected to the inlet tank 66 outside the accommodating portion 43. The inlet tank 66 and the cooling water pipe 106 communicate with each other via the inlet pipe 69. The outlet pipe 70 is connected to the outlet tank 68 outside the accommodating portion 43. The outlet tank 68 and the cooling water pipe 107 communicate with each other through the outlet pipe 70.

The intermediate tank 67 is a box-shaped tank disposed on the fifth plate portion 48 side in the housing portion 43 of the housing 42. The intermediate tank 67 is disposed at a predetermined interval with respect to the third plate portion 46, the fourth plate portion 47, and the fifth plate portion 48. In the intermediate tank 67, the outer surface of the corner in the circumferential direction orthogonal to the flow direction is formed to be a curved surface.
The connecting members 71 and 72 are plate-like members that connect the inlet tank 66, the outlet tank 68, and the intermediate tank 67 to each other.
As shown in FIGS. 5 and 7, the outlet tank 68, the connecting members 71, 72, and the intermediate tank 67 form an outer wall 82 that is continuous without a step in the circumferential direction orthogonal to the flow direction. The outer wall 82 corresponds to an “outer wall” in the claims.

As shown in FIGS. 4, 5, and 7, the cooler core 73 is provided between the first core portion 74 provided between the inlet tank 66 and the intermediate tank 67, and between the intermediate tank 67 and the outlet tank 68. The second core portion 77 is configured.
The first core portion 74 includes a plurality of first tubes 75 that connect the inlet tank 66 and the intermediate tank 67, and a plurality of first fins 76 that are coupled to the outer wall of each first tube 75. The 1st tube 75 is comprised with the flat pipe whose cross section makes a longitudinal shape in a distribution direction. The first fins 76 are corrugated fins made of, for example, a thin plate bent in a wave shape.

The second core portion 77 includes a plurality of second tubes 78 that connect the intermediate tank 67 and the outlet tank 68, and a plurality of second fins 79 that are coupled to the outer wall of each second tube 78. Similar to the first tube 75, the second tube 78 is formed of a thin and flat pipe. The second fins 79 are corrugated fins like the first fins 76.
The cooler core 73 includes a plurality of gaps partitioned by the first fins 76 between the first tubes 75 and a plurality of gaps partitioned by the second fins 79 between the second tubes 78. A passage 80 is provided.

As shown in FIGS. 4, 5, 8, and 9, the gasket 85 includes a base 86, an outer seal portion 95, an inner seal portion 98, and a vibration isolation portion 101.
The base 86 is formed in a band shape so as to extend in the circumferential direction along the inner wall 62 of the housing 42. The base portion 86 is made of metal and has holes 87, 88, 89, 90, 91, and 92 at positions spaced apart in the circumferential direction. These holes 87 to 92 fix the gasket 85 to the inner wall 62 by fitting into any one of the protrusions 53, 54, 55, 56, 57, 58 formed by the inner wall 62 of the housing 42. The protrusions 53 to 58 correspond to “engaged portions” in the scope of the claims, and the holes 87 to 92 correspond to “engaged portions” in the scope of the claims. Hereinafter, when the protrusions 53 to 58 are not particularly distinguished, they are simply referred to as “projections”, and when the holes 87 to 92 are not particularly distinguished, they are simply referred to as “holes”.

The outer seal portion 95 includes a first outer lip 96 protruding from the upstream side in the flow direction of the base portion 86 toward the inner wall 62 side, and a second outer lip 97 of the base portion 86 protruding from the downstream side in the flow direction toward the inner wall 62 side. Become.
The first outer lip 96 protrudes from the base 86 to the opposite side of the second outer lip 97, and the protruding front end extends along the inner wall 62 to the upstream side in the flow direction. The first outer lip 96 extends longer in the flow direction than a first inner lip 99 described later. For this reason, the pressure receiving area of the first outer lip 96 that receives the action of air on the upstream side in the flow direction is larger than the pressure receiving area of the first inner lip 99 that receives the action of air.

The second outer lip 97 protrudes from the base 86 to the side opposite to the first outer lip 96, and the protruding tip extends along the inner wall 62 to the downstream side in the flow direction.
The outer seal portion 95 abuts against the inner wall 62 of the housing 42 at two locations in the flow direction, and hermetically seals the gap between the base portion 86 and the inner wall 62.

The inner seal portion 98 includes a first inner lip 99 protruding from the upstream side in the flow direction of the base portion 86 toward the outer wall 82 side, and a second inner lip 100 protruding from the downstream side of the base portion 86 in the flow direction toward the outer wall 82 side. Become.
The first inner lip 99 protrudes from the base 86 to the opposite side of the second inner lip 100, and the protruding tip extends along the outer wall 82 to the upstream side in the flow direction.
The second inner lip 100 protrudes from the base 86 to the opposite side of the first inner lip 99, and the protruding tip extends along the outer wall 82 to the downstream side in the flow direction.
The inner seal portion 98 abuts against the outer wall 82 of the intercooler 65 at two locations in the flow direction, and hermetically seals the gap between the base portion 86 and the outer wall 82.

The gasket 85 configured as described above has an X-shaped cross section as shown in FIG. 4 perpendicular to the circumferential direction. The outer seal portion 95 functions not only as a sealing unit that seals the gap, but also as a regulating unit that regulates the movement of the base 86 toward the inner wall 62. That is, the outer seal portion 95 positioned between the base portion 86 and the inner wall 62 generates a drag force that suppresses the movement of the base portion 86 that is about to move toward the inner wall 62 side.
The inner seal portion 98 functions not only as a sealing means for sealing the gap, but also as a regulating means for regulating the movement of the base portion 86 toward the outer wall 82 side. That is, the inner seal portion 98 located between the base portion 86 and the outer wall 82 generates a drag force that suppresses the movement of the base portion 86 that is about to move toward the outer wall 82 side.

As shown in FIGS. 6, 7, and 10, the intercooler 65 has an assembly protrusion 83 that protrudes from the intermediate tank 67 to the opposite side of the cooler core 73. As shown in FIG. 10, the fifth plate portion 48 of the housing 42 has an assembly groove 59 into which the assembly projection 83 can be inserted at a position corresponding to the assembly projection 83. The base 86 has a protrusion 93 that extends downstream in the flow direction. The protrusion 93 has a through hole 94 through which the assembly protrusion 83 is inserted.
The vibration isolator 101 is formed integrally with the protruding portion 93 of the base 86 and is made of an elastic body that is pressed between the assembly protrusion 83 of the intercooler 65 and the inner wall of the assembly groove 59 of the housing 42.
The outer seal part 95, the inner seal part 98, and the vibration isolating part 101 are made of rubber, for example, and are joined to the base 86 by baking. In the present embodiment, the outer seal portion 95, the inner seal portion 98, and the vibration isolation portion 101 are integrally formed.

Next, the operation of the air cooler 40 will be described.
Since the gap between the inner wall 62 of the housing portion 43 of the housing 42 and the outer wall 82 of the intercooler 65 is sealed by the gasket 85, all of the air flowing into the housing portion 43 via the introduction pipe 60 of the housing 42 Passes through the air cooling passage 80 of the intercooler 65 and is cooled. The air that has passed through the air cooling passage 80 of the intercooler 65 is supplied to the engine 2 via the outlet pipe 61 of the housing 42 and the like.

  Air upstream of the gasket 85 acts on the first outer lip 96 of the gasket 85 and presses the first outer lip 96 against the inner wall 62. As a result, the first outer lip 96 comes into close contact with the inner wall 62. Air upstream of the gasket 85 acts on the first inner lip 99 of the gasket 85 and presses the first inner lip 99 against the outer wall 82. As a result, the first inner lip 99 comes into close contact with the outer wall 82.

As described above, the gasket 85 according to the first embodiment is the gasket 85 provided between the inner wall 62 of the housing 42 that forms the intake air passage of the engine 2 and the outer wall 82 of the intercooler 65. The outer seal portion 95 and the inner seal portion 98 are provided. The base 86 is formed between the inner wall 62 and the outer wall 82 so as to extend in the circumferential direction orthogonal to the flow direction of the intake air passage.
The outer seal portion 95 is formed integrally with the base portion 86, protrudes outward from the base portion 86, and contacts the inner wall 62. The outer seal portion 95 hermetically seals the gap between the base portion 86 and the inner wall 62 and restricts the movement of the base portion 86 toward the inner wall 62 side.
The inner seal portion 98 is formed integrally with the base portion 86, protrudes inward from the base portion 86, and contacts the outer wall 82. The inner seal portion 98 hermetically seals the gap between the base portion 86 and the outer wall 82 and restricts the movement of the base portion 86 toward the outer wall 82.

According to this, since the gap between the inner wall 62 and the outer wall 82 is blocked by the gasket 85, the air flowing in the housing 42 passes through the air cooling passage 80 of the intercooler 65 without passing through the gap. . The air passing through the air cooling passage 80 is cooled by the heat absorbed by the cooling water of the intercooler 65. Therefore, the cooling efficiency of the intercooler 65 can be increased.
Further, when the gasket 85 that receives the action of air flowing in the housing 42 tries to move toward the inner wall 62 side, the outer seal portion 95 generates a drag that suppresses the movement. Therefore, it is possible to suppress the inner seal portion 98 from floating from the outer wall 82. Further, when the gasket 85 that has been subjected to the action of air tries to move toward the outer wall 82 side, the inner seal portion 98 generates a drag that suppresses the movement. Therefore, the outer seal portion 95 can be prevented from floating from the inner wall 62. Therefore, it is possible to suppress the gap between the gasket 85 and the inner wall 62 and the outer wall 82 due to the gasket 85 floating from the inner wall 62 and the outer wall 82.

In the first embodiment, the outer seal portion 95 includes a first outer lip 96 protruding from the upstream side in the flow direction of the base portion 86 toward the inner wall 62 side, and a downstream portion of the base portion 86 in the flow direction from the downstream side of the flow direction. A second outer lip 97 protruding into the The inner seal portion 98 includes a first inner lip 99 protruding from the upstream side in the flow direction to the outer wall 82 side of the base portion 86, and a second inner lip protruding from the downstream side of the base portion 86 in the flow direction toward the outer wall 82 side. 100.
Thus, according to the gasket 85 whose cross section orthogonal to the circumferential direction is X-shaped, the gasket 85, the inner wall 62 and the outer wall are in contact with the inner wall 62 and the outer wall 82 at two locations on the upstream side and the downstream side in the flow direction. It is possible to further suppress a gap from being formed with 82. Further, since the posture of the gasket 85 is stabilized, vibration of the gasket 85 can be suppressed. Therefore, the sealed state of the gap between the inner wall 62 and the outer wall 82 can be maintained.

In the first embodiment, the first outer lip protrudes from the base 86 to the opposite side of the second outer lip 97, and the protruding tip extends along the inner wall 62 to the upstream side in the flow direction. It is formed. Further, the first inner lip 99 is formed so as to protrude from the base 86 to the opposite side to the second inner lip, and the protruding tip portion extends along the outer wall 82 to the upstream side in the flow direction.
According to this, the first outer lip 96 subjected to the upstream air action against the gasket 85 is pressed against the inner wall 62, and the first inner lip 99 subjected to the air action is pressed against the outer wall 82. Further, the gap between the gasket 85 and the inner wall 62 and the outer wall 82 can be further suppressed.

In the first embodiment, the base 86 is made of metal or resin. Further, the base 86 has a plurality of holes 87 to 92 into which the plurality of protrusions 53 to 58 formed by the inner wall 62 are respectively fitted.
According to this, the gasket 85 can be fixed to the inner wall 62 with a simple configuration, and the assembling property of the gasket 85 is improved.

In the first embodiment, the pressure receiving area of the first outer lip 96 that receives the action of the upstream air with respect to the gasket 85 is larger than the pressure receiving area of the first inner lip 99 that receives the action of the air.
According to this, the gasket 85 which receives the action of the air is further pressed against the inner wall 62 side to which the gasket 85 is fixed, and the holding force is increased.

Further, the gasket 85 according to the first embodiment is formed integrally with the protruding portion 93 of the base portion 86, and is elastically sandwiched between the assembly protrusion 83 of the intercooler 65 and the inner wall of the assembly groove 59 of the housing 42. The anti-vibration part 101 which consists of a body is provided. The vibration isolator 101 is made of, for example, rubber, is formed integrally with the outer seal portion 95 and the inner seal portion 98, and is joined to the base 86 by baking.
According to this, the vibration of the gasket 85 can be suppressed, and the gap between the gasket 85 and the inner wall 62 and the outer wall 82 can be further suppressed. In addition, since the vibration isolating portion also serves as a fixing means for the gasket 85, the number of parts can be reduced and the number of assembling steps can be reduced.

(Second Embodiment)
A gasket according to a second embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 12, the plurality of holes 87 to 92 included in the base portion 86 of the gasket 110 according to the second embodiment are fitted to any one of the plurality of protrusions 122 to 127 formed by the outer wall 121 of the intercooler 120. To do. Thereby, the gasket 110 is fixed to the outer wall 121 of the intercooler 120.

  As shown in FIG. 11, the outer seal portion 111 of the gasket 110 includes a first outer lip 112 and a second outer lip 113, and the inner seal portion 114 includes a first inner lip 115 and a second inner lip 116. The first outer lip 112 extends longer to the upstream side in the flow direction than the first inner lip 115. For this reason, the pressure receiving area of the first outer lip 112 that receives the action of air upstream in the flow direction is larger than the pressure receiving area of the first inner lip 115 that receives the action of air. Therefore, the gasket 110 that receives the action of air is further pressed against the outer wall 121 side to which the gasket 110 is fixed, and the holding force is increased.

(Other embodiments)
In another embodiment of the present invention, the outer seal portion may be composed of only the first outer lip. Moreover, the 1st outer side lip should just contact | abut to the inner wall of an intake air channel | path, and has sealed the clearance gap, and the front-end | tip part does not necessarily need to extend to the upstream of a distribution direction.
In another embodiment of the present invention, the inner seal portion may be composed of only the first inner lip. Moreover, the 1st inner side lip should just contact | abut to the outer wall of an intercooler, and has sealed the clearance gap, and the front-end | tip part does not necessarily need to extend to the upstream of a distribution direction.

In another embodiment of the present invention, the base portion of the gasket may not have an engaged portion that can be engaged with the engaging portion formed by the inner wall of the intake air passage or the outer wall of the heat exchanger. Moreover, when the said engaged part is provided, it does not need to be a hole, For example, a recessed part, a protrusion, etc. may be sufficient.
In another embodiment of the present invention, the pressure receiving area of the outer seal portion of the gasket that receives the action of the upstream fluid in the flow direction may be the same as the pressure receiving area of the inner seal portion that receives the action of the fluid.

In another embodiment of the present invention, the base portion of the gasket does not have a protruding portion, and the gasket may not include a vibration isolating portion.
In another embodiment of the present invention, the base of the gasket is not limited to metal, and may be made of, for example, resin.
In another embodiment of the present invention, a plurality of gaskets may be used for the air cooler.

In other embodiments of the present invention, the gasket may be provided anywhere in the intake air passage. For example, various forms are conceivable, such as being provided on the engine side with respect to the throttle valve device.
In other embodiments of the present invention, the gasket can be applied to various engine systems. For example, the present invention may be applied to an engine system that includes an EGR device, or may be applied to an engine system that does not include a supercharger.

  As described above, the present invention is not limited to the embodiment described above, and can be implemented in various forms without departing from the spirit of the present invention.

2: Engine 62: Inner wall 65, 120: Intercooler (heat exchanger)
82, 121: Outer wall 85, 110: Gasket 86: Base 95, 111: Outer seal 96, 112: First outer lip 97, 113: Second outer lip 98, 114: Inner seal 99, 115: First inner Lip 100, 116: second inner lip

Claims (9)

A gasket provided between an inner wall of an intake air passage of an engine and an outer wall of a heat exchanger installed in the intake air passage;
A base portion extending in a circumferential direction perpendicular to the flow direction of the intake air passage between the inner wall and the outer wall;
Formed integrally with the base, protrudes outward from the base and abuts against the inner wall to hermetically seal the gap between the base and the inner wall, and restricts movement of the base toward the inner wall An outer seal portion to
Formed integrally with the base, protrudes inward from the base and abuts against the outer wall to hermetically seal the gap between the base and the outer wall, and restricts the movement of the base toward the outer wall An inner seal portion to
A gasket comprising: The outer seal portion includes a first outer lip projecting from the upstream side in the flow direction to the inner wall side in the base portion, and a second outer lip projecting from the downstream side in the flow direction to the inner wall side in the base portion. Become
The inner seal portion includes a first inner lip projecting from the upstream side in the flow direction to the outer wall side in the base portion, and a second inner lip projecting from the downstream side in the flow direction to the outer wall side in the base portion. The gasket according to claim 1, wherein   The first outer lip protrudes from the base to the opposite side of the second outer lip, and the protruding tip extends to the upstream side in the flow direction along the inner wall. The gasket as described in.   The first inner lip protrudes from the base to the side opposite to the second inner lip, and the protruding tip extends to the upstream side in the flow direction along the outer wall. Or the gasket of 3.   The gasket according to claim 1, wherein the base portion has an engaged portion that can be engaged with an engaging portion formed by the inner wall or the outer wall.   The gasket according to claim 5, wherein the engaged portion of the base portion is a hole into which the engaging portion configured by a protrusion can be inserted. The engaged portion of the base is engaged with the engaging portion formed by the inner wall,
The pressure receiving area of the outer seal portion that receives the action of the fluid upstream in the flow direction is larger than the pressure receiving area of the inner seal portion that receives the action of the fluid. gasket. The engaged portion of the base is engaged with the engaging portion formed by the outer wall,
The pressure receiving area of the inner seal portion that receives the action of the upstream fluid in the flow direction is larger than the pressure receiving area of the outer seal portion that receives the action of the fluid. gasket. The base has a protrusion extending in the flow direction,
The anti-vibration part which is formed integrally with the said protrusion part of the said base part, and consists of an elastic body clamped by the said inner wall and the said outer wall is further provided, The Claim 1 characterized by the above-mentioned. Gasket.

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